MolSynapsequestion bank
MolSynapse / Question bank / Amines and Aromatic Nitrogen Compounds / Diazonium salts: preparation and synthetic uses
JEE Advanced levelOne or more correct optionsDifficulty 3 of 3nc143

Which statements about coupling of arenediazonium salts are correct?

  1. A2-Naphthol couples at C-1 to give 1-(phenylazo)-2-naphthol.
  2. BPhenol couples at the para position to give 4-hydroxyazobenzene.
  3. CIf the para position of the phenol is blocked, as in 4-methylphenol, coupling occurs at an ortho position.
  4. DToluene couples readily with benzenediazonium chloride in mildly acidic medium.

Answer: A, B, C

The diazonium ion attacks the most activated position of a strongly activated ring: C-1 of 2-naphthol, para in phenol, ortho when para is blocked. Toluene is not activated enough for the weakly electrophilic diazonium ion, so (D) is wrong.
Practice Amines and Aromatic Nitrogen Compounds More on Diazonium salts: preparation and synthetic uses
Previous questionNext question

More questions on Diazonium salts: preparation and synthetic uses